Projection System Wavelength-Selective Optical Modules
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Solution Overview
Problem
In facilities like movie theaters, the light from light source units is often noticeable, making it difficult for users wearing eyeglass-type devices to visually recognize projected three-dimensional stereoscopic images.
Innovation Solution
A projection system comprising a projection device that simultaneously projects first and second image lights, an eyeglass-type device with optical modules to transmit these lights, and light source units emitting source lights within a visible light band with transmittance equal to or less than a predetermined value in both optical modules, minimizing interference with the projected images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light source units emit visible light to be noticeable in the facility, then the light source units are easily recognized by users, but the projected images become difficult to visually recognize
Solution Approach 1:
The patent applies local quality by making the optical modules have wavelength-selective transmittance characteristics. The optical modules transmit specific wavelength bands (corresponding to projection light) while blocking other wavelength bands (emitted by light source units). This creates different optical properties for different spatial locations and wavelength ranges, allowing the projected images to be clearly visible through the optical modules while light source unit emissions are blocked, thus resolving the contradiction between light source visibility and image quality.
2Illumination intensity
If light source units use wavelengths that transmit through optical modules, then the light source units are noticeable, but this creates harmful interference with the three-dimensional stereoscopic images
Solution Approach 1:
The patent applies parameter changes by carefully selecting the wavelength characteristics of light source units to fall within blocked wavelength ranges of the optical modules. The optical modules are designed with specific transmittance characteristics that allow projection light wavelengths to pass through while blocking wavelengths emitted by light source units. This parameter selection ensures that light source units remain noticeable (within visible spectrum) but do not interfere with the three-dimensional stereoscopic images, as their light is blocked by the optical modules.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively prevents the projected image from becoming difficult to visually recognize by reducing the visibility of the light source units' light, while allowing users to easily recognize the light source units when needed, such as in emergency situations.
Implementation Method 1
a first optical module configured to transmit the first image light projected by the projection device and a second optical module configured to transmit the second image light projected by the projection device
Implementation Method 2
at least one light source unit configured to emit a source light of wavelengths that are in a visible light band and have a transmittance equal to or less than a predetermined value in both the first optical module and the second optical module
Data Source
AI summary
A projection system includes a projection device configured to simultaneously project a first image light for a first image and a second image light for a second image; an eyeglass-type device which is to be worn by a user and configured to include a first optical module configured to transmit the first image light projected by the projection device and a second optical module configured to transmit the second image light projected by the projection device; and at least one light source unit configured to emit a source light of wavelengths that are in a visible light band and have a transmittance equal to or less than a predetermined value in both the first optical module and the second optical module.